How to work with AsyncTask when screen rotates

Question

I have an activity in my android app that calls an asynctask on onCreateView()

Here is my code :

 @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_weeklyprofit);
            fromDateTxt=(TextView)findViewById(R.id.fromDate);
            toDateTxt = (TextView)findViewById(R.id.toDate);

         GetXYPoints getXY = new GetXYPoints();
         getXY.execute(fromDateTxt.getText().toString(),toDateTxt.getText().toString());

}

now my application needs to rotate, so i need to store data when rotate :

I have implemented this as below :

@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
    super.onSaveInstanceState(savedInstanceState);

    savedInstanceState.putString("from", fromDateTxt.getText().toString());
    savedInstanceState.putString("to", toDateTxt.getText().toString());

}

@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
    super.onRestoreInstanceState(savedInstanceState);
    SystemClock.sleep(500);
    fromDateTxt.setText(savedInstanceState.getString("from"));
    toDateTxt.setText(savedInstanceState.getString("to"));

     GetXYPoints getXY = new GetXYPoints();
     getXY.execute(fromDateTxt.getText().toString(),toDateTxt.getText().toString());
}

So i recall the asynctask again with restored data, my problem is that the activity run again when rotate and the it calls onRestoreInstanceState so how can i prevent the activity from calling the first asyncktask?

In other way what is the best solution to store data returned by an asynck task when screen is rotate?

SImply take one boolean flag and when first time it will be false after set to true So when flag true call AsyncTask. — Haresh Chhelana, Oct 06 '15 at 09:48
Possible duplicate of [Don't reload application when orientation changes](http://stackoverflow.com/questions/5913130/dont-reload-application-when-orientation-changes) — Haresh Chhelana, Oct 06 '15 at 09:50

score 2 · Accepted Answer · edited May 23 '17 at 10:26

2

i would suggest you to to make sure you actually need your activity to be reset on a screen rotation (the default behavior). Every time I've had issues with rotation I've added this attribute to my tag in the AndroidManifest.xml, and been just fine.

android:configChanges="keyboardHidden|orientation"

source How to handle an AsyncTask during Screen Rotation?

edited May 23 '17 at 10:26

Community

1
1

answered Oct 06 '15 at 09:49

Aayushi

574
3
14

this works, but may lead to layout-problems if you specify different layouts for landscape and portrait! – dy_ Oct 06 '15 at 09:53
you can also read this blog http://www.androiddesignpatterns.com/2013/04/retaining-objects-across-config-changes.html for different method – Aayushi Oct 06 '15 at 09:57
Its working but if i'm not specifying different layout for landscape and portrait – Amalo Oct 06 '15 at 10:11
otheerwise you can use 1)Volley -> http://www.androidhive.info/2014/05/android-working-with-volley-library-1/ 2)LoopJ -> http://loopj.com/android-async-http/ – Aayushi Oct 06 '15 at 10:17

score 1 · Answer 2 · answered Oct 06 '15 at 09:48

1

In your AndroidManifest.xml add following for prevent reloading activity when orientation change

android:configChanges="orientation|screenSize"

So, you'll have something like this:

<activity android:name="Activity"
android:configChanges="orientation|screenSize">
</activity>

Hope it works!

answered Oct 06 '15 at 09:48

Anoop M Maddasseri

10,213
3
52
73

this works, but may lead to layout-problems if you specify different layouts for landscape and portrait! – dy_ Oct 06 '15 at 09:53

How to work with AsyncTask when screen rotates

2 Answers2